Living Environment - January 2010

6 Some bloodsucking insects insert their mouthparts directly into a blood vessel and withdraw
blood. Other bloodsucking insects have mouthparts that cut through the skin and blood vessels
and produce a small pool of blood from which they feed. Both mouthpart types are specialized
for

(1) autotrophic nutrition
(2) heterotrophic nutrition
(3) regulation
(4) excretion

7 If the ribosomes of a cell were destroyed, what effect would this most likely have on the cell?

(1) It would stimulate mitotic cell division.
(2) The cell would be unable to synthesize proteins.
(3) Development of abnormal hereditary features would occur in the cell.
(4) Increased protein absorption would occur through the cell membrane.

8 Which substances play an important role in communication between cells in a multicellular
organism by acting as chemical messengers?

(1) fats               (3) minerals
(2) antibiotics      (4) hormones

9 The diagram below illustrates asexual reproduction in yeast.


Yeast produce offspring that usually have

(1) genes that are different from those of the parent
(2) genes that are identical to those of the parent
(3) half of the genetic information of the parent
(4) organelles that are not found in the parent

10 The molecule represented below is found in living things.


Which statement describes one characteristic of this molecule?

(1) It is the template for the replication of genetic information.
(2) Organic catalysts are made up of these molecules.
(3) It is different in each cell of an organism.
(4) Cell membranes contain many of these molecules. 

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