Which of the following conclusions is best supported by the data?
(A) Bicoid protein inhibits translation of caudal mRNA.
(B) Bicoid protein stabilizes caudal mRNA.
(C) Translation of bicoid mRNA produces caudal protein.
(D) Caudal protein stimulates development of anterior structures.
Answer: (A) Bicoid protein inhibits translation of caudal mRNA.
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Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?
A) catabolism (catabolic pathways) B) metabolism C) anabolism (anabolic pathways) D) dehydration
Which of the following is not a characteristic of plasma-membrane carbohydrates?
a) all face outward into the extracellular space b) some are linked to lipids c) all float freely within the membrane d) more than 90% of them are linked to proteins
Which of the following could be used as evidence for spontaneous generation?
A) Gauze-covered meat will not give rise to maggots. B) Shaking Pasteur's S-necked flasks did spoil the broth. C) Uncovered meat will give rise to maggots. D) The broth in Pasteur's S-necked flasks did not spoil. E) Flies lay eggs that develop into maggots.
Which of the following is NOT a characteristic of protozoa?
A. most exhibit asexual reproduction. B. they are single-celled organisms. C. they are eukaryotic organisms. D. they are all photosynthetic. E. they frequently possess cilia or flagella.