Which of the following statements about insect hormones is false?
A. High levels of circulating juvenile hormone
inhibit molting.
B. Ecdysone is released from the prothoracic
gland and stimulates molting.
C. PTTH stimulates the release of ecdysone
to trigger molting and metamorphosis.
D. In the absence of juvenile hormone, an
insect will metamorphose into the adult form.
E. None of the answer options is false.
A
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If a plant cell is stripped of its cell wall it forms a protoplast. A protoplast would _____
A. be connected to adjacent protoplasts by a middle lamella. B. be surrounded by cellulose. C. be less rigid than a plant cell. D. be stronger than a plant cell.
Four of the five organisms listed below are
autotrophs. Select the exception. a. self-nourishing organisms b. organisms whose carbon source is CO2 c. chemosynthetic organisms d. most bacteria e. sulfur bacteria
Which component is responsible for initially stimulating a muscle contraction?
a) proteins b) electrochemical signals c) plasma membranes d) striations
Two "magic" solutions are sold by a research supply company. "Magic Solution A" promises to extract all proteins, including integral membrane proteins, from the plasma membrane. "Magic Solution B" promises to simply extract all peripherally associated membrane proteins. What is the likely composition of "Magic Solution A" and "Magic Solution B"?
A. "Solution A" and "Solution B" both contain high salt buffers that disrupt hydrogen bonds and ionic interactions. B. "Solution A" is a high salt buffer that disrupts hydrogen bonds and ionic interactions, "Solution B" is a membrane solubilizing detergent. C. "Solution A" and "Solution B" both include membrane solubilizing detergent(s). D. "Solution A" is a membrane solubilizing detergent, "Solution B" is a high salt buffer that disrupts hydrogen bonds and ionic interactions.