Biology Test 41

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Biology Test 41

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following occurs when speciation happens in quick and rapid bursts, in a small population?

A
Reproductive isolation

B
Disruptive selection

C
Stabilising selection

D
Genetic drift

Solution

Reproductive isolation occurs when speciation happens in quick and rapid bursts, in a small population.

Speciation requires that the two incipient species be unable to produce viable offspring together or that they avoid mating with members of the other group.
Question 2
4 / -1

Which of the following shows the correct order from oldest to youngest of these species?

A
Homo habilis - Homo erectus - Homo sapiens - Australopithecus afarensis

B
Homo sapiens - Australopithecus afarensis - Homo erectus - Homo habilis

C
Australopithecus afarensis - Homo habilis - Homo erectus- Homo sapiens

D
Homo erectus - Homo habilis - Australopithecus afarensis - Homo sapiens

Solution

Australopithecine specimens are older than specimens from the genus Homo.

The correct sequence will be Australopithecus afarensis - Homo habilis - Homo erectus- Homo sapiens.
Question 3
4 / -1

Which of the following is the correct chronological sequence of the epochs of cenozoic era?

A
Miocene, Paleocene, Pleistocene, Eocene, Oligocene and Pliocene

B
Palecoene, Pleistocene, Eocene, Pliocene, Oligocene and Miocene

C
Eocene, Oligocene, Pliocene, Palaeocene, Miocene and Pleistocene

D
Palaeocene, Eocene, Oligocene, Miocene, Pliocene and Pleistocene

Solution

The Cenozoic Era is divided into the Palaeogene period (which consists of the Palaeocene, Eocene and Oligocene epochs), the Neogene period (which consists of the Miocene and Pliocene epochs) and the Quaternary period (the Pleistocene and Holocene epochs).
Question 4
4 / -1

Which of the following combinations of structural features is expected to be present in a secretory cell?

A
Well-developed rough endoplasmic reticulum and prominent golgi bodies

B
Abundant lysosomes and secretory granules

C
Enlarged nucleus and well-developed rough endoplasmic reticulum

D
Well-developed smooth endoplasmic reticulum and secretory granules

Solution

Secretory cells have abundant rough endoplasmic reticulum and prominent golgi bodies.
Question 5
4 / -1

Directions For Questions

Consider the following processes:

A. Breakdown of extra-cellular materials by releasing enzymes into the surrounding medium

B. Digestion of material taken up by phagocytosis or pinocytosis

C. Digestion of parts of the cell by autophagy

...view full instructions

Which of the above processes is/are the function(s) of lysosomes?

A
Only A

B
Only C

C
A, B and C

D
Both B and C

Solution

Both B and C statements are functions of lysosomes.
Question 6
4 / -1

Carbon monoxide inhibits mitochondrial electron transport by

A
inhibiting the electron transfer of complex I

B
binding to the oxygen-binding site of cytochrome oxidase

C
blocking electron transport at the level of the cytochrome b-c complex

D
binding to haemoglobin in the erythrocytes and therefore, blocking the transport of oxygen to tissues

Solution

Carbon monoxide is toxic for mitochondria in man, altering the mitochondrial respiratory chain at the cytochrome c oxidase level. This inhibition in cytochrome c oxidase may play a role in the development of the symptoms observed in acute CO poisoning, and in some diseases related to smoking.
Question 7
4 / -1

During cell division, one of the cell organelles, instead of being equally divided between the two daughter cells at cytokinesis, becomes dispersed into small vesicles at prophase to reassociate at telophase. The organelle is

A
mitochondrion

B
endoplasmic reticulum

C
golgi apparatus

D
centriole

Solution

At prophase, the entire golgi is dispersed into small vesicles that reassociate at telophase to reconstruct the organelle.

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Biology Test 41

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Biology Test 41

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SHARING IS CARING

Question 1

Reproductive isolation

Disruptive selection

Stabilising selection

Genetic drift

Solution

Question 2

Homo habilis - Homo erectus - Homo sapiens - Australopithecus afarensis

Homo sapiens - Australopithecus afarensis - Homo erectus - Homo habilis

Australopithecus afarensis - Homo habilis - Homo erectus- Homo sapiens

Homo erectus - Homo habilis - Australopithecus afarensis - Homo sapiens

Solution

Question 3

Miocene, Paleocene, Pleistocene, Eocene, Oligocene and Pliocene

Palecoene, Pleistocene, Eocene, Pliocene, Oligocene and Miocene

Eocene, Oligocene, Pliocene, Palaeocene, Miocene and Pleistocene

Palaeocene, Eocene, Oligocene, Miocene, Pliocene and Pleistocene

Solution

Question 4

Well-developed rough endoplasmic reticulum and prominent golgi bodies

Abundant lysosomes and secretory granules

Enlarged nucleus and well-developed rough endoplasmic reticulum

Well-developed smooth endoplasmic reticulum and secretory granules

Solution

Question 5

Only A

Only C

A, B and C

Both B and C

Solution

Question 6

inhibiting the electron transfer of complex I

binding to the oxygen-binding site of cytochrome oxidase

blocking electron transport at the level of the cytochrome b-c complex

binding to haemoglobin in the erythrocytes and therefore, blocking the transport of oxygen to tissues

Solution

Question 7

mitochondrion

endoplasmic reticulum

golgi apparatus

centriole

Solution

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