Biology 401-450 MCQs

Biology

401. In esterification OH comes from ________ ?

a. Organic acid

b. Alcohol

c. Water

d. Sugar

402. How many carbon atoms are required to form a furan ring (ribofuranose) _______ ?

a. 3

b. 4

c. 5

d. 2

403. Sleep movements are a type of ________ ?

a. Turgor movements

b. Growth movements

c. Tactic movements

d. Paratonic movements

404. Keto group is represented as _______ ?

a. CO

b. C-COO-C

c. HCOH

d. HOH

405. The type of learning in which there is loss or decrease in response to repeated stimuli?

a. Imprinting

b. Habituation

c. Latent learning

d. Insight learning

406. Glycolipids and glycoproteins have structural role in the _______ matrix of animal and bacterial cell?

a. Extracellular

b. Intracellular

c. Both of these

d. Glucose

407. The cells present in testes and secrete testosterone are ________ ?

a. Sertoli cells

b. Germinal cell

c. Interstitial cells

d. Spermatocyte

408. In Cx(H2O)y x ranges from _________ ?

a. 1 to 3 thousand

b. 3 to many thousand

c. 3 to 5 thousand

d. 5 to 9 thousand

409. Exposure to low temperature stimulates plants to flower. This is called ________ ?

a. Photoperiodism

b. Thermotropism

c. Vernalisation

d. Thermoregulation

410. The basic structural unit of a chromosome is ________ ?

a. The centromere

b. Nucleosome

c. Telomere

d. Histone

411. In living organisms the lubricant which provides protection against damage resulting from friction is _______ ?

a. Carbohydrates

b. Fatty acid

c. Water

d. Protein

412. The first stage of development in which a cavity appears is the _______ ?

a. Neurula

b. Morula

c. Gastrula

d. Blastula

413. The trioses which are intermediate in respiration and photosynthesis are ________ ?

a. Glyceraldehydes

b. Dihydroxy acetone

c. Both of these

d. None of these

414. The monosaccharide found in some bacteria and occurring rarely are ________ ?

a. Trioses

b. Hexoses

c. Tetroses

d. Pentoses

415. The one which causes contraction of wall of the uterus during and after birth?

a. ADH

b. MSH

c. Oxytocin

d. Progesterone

416. Which statement correctly describes the transcription of DNA?

a. It produces another DNA molecule

b. It produces mRNA

c. It is a semi conservation process

d. It occurs at surface of ribosomes

417. Triglyceride is also known as _______ ?

a. Natural lipid

b. Neutral lipid

c. Neutral wax

d. All of these

418. Carbon commonly combines with ______ ?

a. H

b. N & O

c. P & S

d. All of these

419. The sequence of 3 bases on tRNA which is complementary to codon of mRNA is called _______ ?

a. Gene

b. Anticodon

c. Code

d. Codon

420. The survival of an animal depends upon its ability to take some from its environment _______ ?

a. Chemicals

b. Hydrocarbons

c. Organic molecules

d. Inorganic molecules

421. In humans the number of tetrads formed during mitosis is _______ ?

a. 23

b. 46

c. 0

d. 4

422. Non polar organic molecules are ________ in water?

a. Soluble

b. Insoluble

c. Partially soluble

d. Depends upon condition

423. Interconversion of carbohydrates proteins and lipids in living cells are an example of _______ ?

a. Coordinated catabolic activities

b. Coordinated anabolic activities

c. Both A and B

d. Any one

424. Which one of the following is correct sequence of stages of prophase 1 of meiosis.

a. Diakinesis diplotene pachytene leptotene zygotene

b. Zygotene leptotene pachytene diplotene diakinesis

c. Leptotene zygotene pachytene diplotene diakinesis

d. Pachytene leptotene diplotene zygotene diakinesis

425. Which one of the following syndrome is the result of meiotic non dysjunction?

a. Klinefelter's syndrome

b. Turners syndrome

c. Downs syndrome

d. All of these

426. Which one of the following stage precedes mitosis during cycle?

a. G1 phase

b. S phase

c. G2 phase

d. M phase

427. Most of the cellular secretions are _______ in nature?

a. Glycolipids

b. Glycoproteins

c. Nucleohistones

d. Proteins

428. Genes will not be found in gene pairs in the _______ ?

a. Muscle cell of worm

b. Uterine cells of dog

c. Sperm cells of frog

d. Guard cells of leaf

429. rRNA constitutes _______ % of the total cellular RNA?

a. 3-4 %

b. 10-20 %

c. 80 %

d. 90 %

430. A genome is _______ ?

a. Appearance of an individual

b. Genetic basis of few characters

c. Full set of genes of an individual

d. All of these

431. Which conjugated molecules play important role in gene expression _______ ?

a. Glycolipids

b. Glycoproteins

c. Nucleohistones

d. None of these

432. There are mainly ________ types of tRNA?

a. 170

b. 20

c. 25

d. 15

433. The disease in which transmembrane carrier for the chloride ion is not produced is ________ ?

a. Hyper chloesterolemia

b. Cystic fibrosis

c. Severe combined immunodeficiency syndrome

d. AIDS

434. The one which is a weed killer is _______ ?

a. IAA

b. NAA

c. 2 4-D

d. GA

435. Five kingdom classification was proposed by _______ ?

a. Carolus Linnaeus

b. E-Chatton

c. Robert Whittaker

d. Lynn Margulis and Karlene Schwartz

436. Organisms of which of the following kingdom have absorptive mode of nutrition _______ ?

a. Prokaryotae

b. Protoctista

c. Animalia

d. Fungi

437. Which of the Euglenas (a Protoctista) character resembles that of animals _______ ?

a. They can move

b. They lack cell wall

c. They do not have chlorophyll

d. Both a and b

438. The one which can break open a plasmid ring is ________ ?

a. Ligase enzyme

b. Primase enzyme

c. Restriction endonuclease

d. ATP-ase enzyme

439. Allium cepa is the scientific name of ______ ?

a. Onion

b. Amaltas

c. Potato

d. Tomato

440. According to Lamarck evolution occurred as the result of ________ ?

a. Natural selection

b. The theory of recapitulation

c. Inheritance of acquired characters

d. Over production

441. Which of the following category is most general with its members lest resembling with each other than the other categories ________ ?

a. Species

b. Genus

c. Family

d. Order

442. The first eukaryotes appeared about ________ years ago?

a. 1.5 billion

b. 2.5 billion

c. 3.5 billion

d. 4.5 billion

443. Those organisms which can prepare their own food from simple inorganic material and can store energy are called ________ ?

a. Autotrophs

b. Heterotrophs

c. Procariotique

d. Eu-cariotique

444. Solanum tuberosum is a scientific name of ________ ?

a. Onion

b. Amaltas

c. Potato

d. Tomato

445. The structure which has been formed or modified from gill pouches in humans is ________ ?

a. Gills

b. Eustachian tube

c. Middle ear

d. Lungs

446. Scurvy and beriberi and caused by the deficiency of ________ ?

a. Vitamin B and C

b. Vitamin B and D

c. Vitamin C and B

d. Vitamin A and B

447. The word which E-Chatton suggested for bacteria and blue green algae was _______ ?

a. Autotrophs

b. Heterotrophs

c. Pro-cariotique

d. Eu-cariotique

448. The greatest diversity of animals in the lake is found in which one of the following zones?

a. Limnetic zone

b. Littoral zone

c. Profundal zone

d. None of these

449. So far over ________ number of species of animals are known?

a. 3 million

b. 1 million

c. 1

d. 2 million

450. What is the characteristic feature of consumers?

a. Autotroph

b. Heterotroph

c. Parasite

d. Saprophyte