The part of the microscope indicated by the arrow in Figure 4.1 is the (ocular/objective/condenser) lens.
Fill in the blank(s) with the appropriate word(s).
condenser
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In butterflies, males are the ________ sex
A) homozygous B) heterozygous C) homogametic D) heterogametic E) hemizygous
Where is the majority of DNA located in a human cell?
A. nucleus B. mitochondrion C. chloroplast D. ribosome
Why is penicillin ineffective against gram-negative bacteria?
a. Penicillin is not toxic to gram-negative bacteria. b. Penicillin is pushed away from the cell membrane by the fimbriae. c. Gram-negative bacterial do not have receptors for penicillin to attach to. d. Gram-negative bacteria do not have channels or pores in its membrane for penicillin to pass through. e. Penicillin cannot reach the thin peptidoglycan layer easily because it is protected by the bacteria’s outer membrane.
Active transport must function continuously because _______.
a) cells must be in constant motion b) facilitated transport opposes active transport c) diffusion is constantly moving the solutes in the other direction d) plasma membranes wear out