Mdis Exam 3

Question 1

which natural substances often contain choline

Answer 1

phospholipids

Question 2

the energy of a photon in the photosynthesis process is used directly to

Answer 2

pump H+ from the stroma to the thylakoid lumen

Question 3

The condition in which there is adecreasein the number of white blood cells in humans is known as:

Answer 3

leukopenia

Question 4

From which grandparent or grandparents did you inherit your mitochondria ?

Answer 4

maternal grandmother

Question 5

Synapsis and crossing over of chromosomes occurs in which phases of meiosis?

Answer 5

prophase

Question 6

Which of the followingis NOT a mode of genetic exchange within a bacterial population?

Answer 6

translation

Question 7

The physical appearance and properties of an organism which is the expression of the genetic makeup is called the:

Select one:

Answer 7

phenotype

Question 8

Which of the following is one of the post transcriptional changes in Eukaryotes?

Answer 8

splicing

Question 9

In which of the following cell structures does protein synthesis take place

Answer 9

mitochondria and chloroplasts

Question 10

The alpha helix and beta sheet are both involved in the arrangement of

Select one:

Answer 10

Secondarystructure of proteins

Question 11

Loss of one nucleotide in a DNA molecule has generally

Answer 11

The correct answer is:Greater effect than nucleotide substitution

Question 12

Loss of one nucleotide in a DNA molecule has generally

Select one:

Answer 12

Greater effect than nucleotide substitution

Question 13

What will be the possible blood group/s of the progeny of a mother with blood type A and a father with a blood type B?

Answer 13

AB, A, B or O

Question 14

What is true concerning Thewobble positionin protein synthesis:

Select one:

Answer 14

:The wobble hypothesis explains why there is 61 possible codons but less than 61 different anti-codons

Question 15

Which one of the following amino acids is positively charged?

Answer 15

lysine

Question 16

an allele is

Answer 16

The correct answer is: An alternative form of a gene found at the same locus on homologous chromosomes

Question 17

Which of the following statements on the biosynthesis of nucleic acids and proteinsisfalse?

Answer 17

:A sequence of amino acids in a polypeptide chain is termed a structural gene

Question 18

Transcription is the transfer of information from the nucleotide sequence…:

Answer 18

Select one:

A. of RNA into primary structure of proteins

B. of RNA into DNA sequence

C. of mRNA into tRNA anticodone

D. of DNA into primary structure of proteins

E. There is no correct answer

there is no correct answer.

Question 19

Darwin postulated that the major factor influencing evolution

Answer 19

natural selection

Question 20

Find thefalsestatement among the following

Answer 20

Select one:

A.Anticodon is a part of the tRNA

B.Codon is a triplet found in the mRNA

C.Anticodon and codons must be complementary

D.Sugar-phosphate backbone is a part of the DNA & of the RNA molecule

E.For transcription DNA polymerase is used

E

Question 21

Choose thewrongstatement concerning the result of Insulin secretion by the pancreas

Answer 21

Gluconeogenesis by the liver

Question 22

What is the name of the following amino acid:

Answer 22

aspartate

Question 23

Blood flow to the skin

Answer 23

increases when external environmental temperature rises

Question 24

Which of the following secrete gastric acid?

Answer 24

parietal cells

Question 25

Rugea can be found in the

Answer 25

stomach

Question 26

Which of the following enzymes is not secreted by the pancreas?

Answer 26

pepsin

Question 27

The most distal part of the stomach is called: Select one:

Answer 27

pylorus

Question 28

This is direction of diffusion of gasses at the alveoli of the lungs.

Answer 28

Oxygen into blood, carbon dioxide out of blood

Question 29

If pH decreases or PCO2 increases, the amount of oxygen bound to hemoglobin

Answer 29

decreases

Question 30

The tuft of capillaries in the renal corpuscle is called the

Answer 30

glomerulus

Question 31

Which of the following is NOT a process done by the kidneys in order to keep a constant blood PH?

Answer 31

excertion of CO2

Question 32

Which of these substances normally cannot pass through the filtration membrane?

Answer 32

hemoglobin

Question 33

This term means entry of substances into the body from the filtrate.

Answer 33

reabaorption

Question 34

When ADH levels in the blood are high, the collecting ducts are:

Answer 34

very permeable to water

Question 35

Glands that produce hormones are

Answer 35

endocrine gland

Question 36

The embryonic germ layer from which the skin and nervous system are derived is Select one:

Answer 36

ectoderm

Question 37

Which of these is NOT a chemical mediator of inflammation?

Answer 37

neutrophils

Question 38

Harvestian canal contains:

Answer 38

Blood vessels

Question 39

Which of these results occur in response to the release of chemical mediators? Select one:

Answer 39

Select one: A. Vasodilation B. Chemotactic attraction of phagocytes C. Increased vascular permeability D. Redness and swelling E. All of these E

Question 40

In the process of oogenesis, a polar body

Answer 40

is formed before fertilization. B. is formed after fertilization

Question 41

The resting potential indicates that the inside of the neuron is ________ compared to the outside.

Answer 41

negative

Question 42

In humans, transmission of nerve impulses across a synaptic cleft is carried out by ________. Select one:

Answer 42

neurotransmitter molecules