Midterm MCQ

Which organism can best be described as a saprotroph? A. A fungus that digests its food externally and absorbs the products of digestion B. A beetle that feeds by ingesting the dung of other animal species and digesting its food internally C. A single-celled eukaryote that is able to photosynthesize and consumes smaller organisms by endocytosis D. A giraffe that feeds by ingesting leaves from an acacia tree

A

Which organisms produce methane in anaerobic environments such as waterlogged soils? A. Archaea B. Fungi C. Eukaryotes D. Eubacteria

A

Living organisms control pH within their tissues. What is a reason for regulating pH? A. All parts of a body must be kept at the same pH to survive. B. Many reactions can only happen at specific pH levels. C. pH affects osmosis. D. Control of active transport is achieved by pH.

B

What is common to RNA and DNA? A. Thymine B. Nitrogenous bases C. Histones D. Deoxyribose

B

Which process(es) occur(s) by osmosis? I. Uptake of water by cells in the wall of the intestine II. Loss of water from a plant cell in a hypertonic environment III. Evaporation of water from sweat on the skin surface A. I only B. I and II only C. II and III only D. I, II and III

B

Creeper in chickens is a condition in which the chickens are born with very short legs. The creeper allele (C) is dominant over the normal allele (c). Embryos which are homozygous for the dominant allele fail to develop into viable chickens and die before they hatch. What phenotypic ratio would you expect in the live offspring of a cross between two creeper chickens? A. All creeper B. 1 creeper; 2 normal C. 2 creeper; 1 normal D. 3 creeper; 1 normal

C

What is produced by type II pneumocytes? A. Epinephrine B. Elastase C. Pulmonary surfactant D. Alpha 1-antitrypsin

C

Which is an example of natural selection? A. A giraffe stretching its neck to reach higher leaves B. A juvenile bird learning to sing C. Development of antibiotic resistance in bacteria D. Selective breeding of tail-less cats

C

The gene that codes for a particular polypeptide includes the base sequence shown. GAGTACCCT What is the base sequence of the mRNA molecule which is complementary to this sequence? A. GAGTACCCT B. CTCATGGGA C. GUGTUCCCT D. CUCAUGGGA

D

The system of sex determination in chimpanzees (Pan troglodytes) is the same as in other mammals. A chimpanzee has 48 chromosomes in the nuclei of its body cells. What can be deduced from this information? A. The sex of the chimpanzee B. The number of genes in each chromosome C. Whether non-disjunction has occurred D. The number of autosomes in a diploid cell

D

Which statement applies to HIV? A. HIV infects red blood cells resulting in decreased production of hemoglobin. B. HIV can be effectively treated using antibiotics. C. HIV can only be transmitted by sexual intercourse. D. HIV causes a reduction in production of antibodies.

D

Which type of chemical reaction is an example of anabolism? A. Photolysis B. Combustion C. Hydrolysis D. Condensation

D