Early microscopes did not allow clear visualization of cells because they were limited by

A) magnification.
B) number of kernels.
C) resolution.
D) refraction.
E) both magnification and resolution.


Answer: E

Biology & Microbiology

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An animal's reward for pollinating a flower may include all of the following except ________

a. seeds b. high-energy oils c. the illusion of sexual intercourse d. nectar and pollen

Biology & Microbiology

Statements 63–67 ask about membrane permeability. For each

one, select the best choice from the following five processes below. a. simple diffusion b. facilitated diffusion c. osmosis d. active transport e. endocytosis E 63. This process is used by white blood cells to ingest bacteria. E 64. This process specifically moves water molecules across a differentially permeable membrane. E 65. This process explains the movement of any kind of molecule from areas of higher concentration to areas of lower concentration. E 66. The method by which glucose crosses the plasma membrane. M 67. This process explains the movement of molecules against a concentration gradient.

Biology & Microbiology

Which of the following statements about pseudogenes is false?

(a) Pseudogenes code for microRNAs. (b) Pseudogenes share significant nucleotide similarity with functional genes. (c) Pseudogenes are no longer expressed in the cell. (d) There are estimated to be approximately 20,000 pseudogenes in the human genome.

Biology & Microbiology

Which term is analogous to the word "niche"?

A. job description B. desires C. address D. needs E. properties

Biology & Microbiology