In your Drosophila laboratory, you find a larva that is missing segments Lb, T1, T2, and T3. This larva probably has a mutation in a ________ gene.
A. gap or segment-polarity
B. segment-polarity
C. gap
D. maternal effect
E. pair-rule
Answer: C
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Which of the following influence(s) the efficiency of an antimicrobial agent?
A. temperature B. duration of exposure C. concentration of the agent D. All of the choices are correct.
A water-vascular system is characteristic of the
phylum a. Arthropoda. b. Annelida. c. Chordata. d. Mollusca. e. Echinodermata.
Penicillin works most effectively against gram-positive bacteria because:a
penicillin affects cell membranes. b. they have a thick peptidoglycan cell wall, and penicillin affects the synthesis of peptidoglycans. c. they have special protein channels that allow penicillin to enter the cell and halt the cell cycle. d. they are smaller than gram-negative bacteria and, thus, easily take up penicillin by diffusion. e. they contain prophages that negatively interact with penicillin.
An example of a freshwater wetland is an estuary
____________________ Indicate whether the statement is true or false.