The cells that line the inside of the blastopore become the
A) nervous system.
B) muscles.
C) skin.
D) skeleton.
E) digestive tract.
E
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In a branched pathway with many end products, an abundance of one of the end products will usually inhibit
A. the first committed step in the branch of the pathway leading to the production of that particular product. B. the last step before the branch leading to the production of that particular end product. C. the last step in the production of that particular product. D. the first step in the set of pathways.
Which of the following is a type of local signaling in which a cell secretes a signal molecule that affects neighboring cells?
A) hormonal signaling B) autocrine signaling C) paracrine signaling D) synaptic signaling
Our agricultural populations are maintained artificially. This means that
A. mutation must be stopped. B. random mating is prohibited. C. gene frequencies are allowed to change. D. asexual reproduction must be prohibited.
What is the key difference between photoheterotrophs and photoautotrophs?
a. Photoautotrophs only use bacteriochlorophyll; photoheterotrophs only use chlorophyll a. b. Photoheterotrophs produce oxygen as a by-product; photoautotrophs do not. c. Photoheterotrophs use hydrogen sulfide for reducing power; photoautotrophs do not. d. Photoheterotrophs use organic compounds as their carbon source; photoautotrophs use carbon dioxide as their carbon source.