Which organelle breaks down organelles that are no longer useful?
A. Golgi apparatus
B. lysosome
C. endoplasmic reticulum
D. mitochondria
Ans: D. mitochondria
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The bacteria that appear to maintain balance between the members of the normal microbiota and play a vital role in limiting colonization by pathogens are
A. staphylococci. B. diptheroids. C. Candida spp. D. Malassezia spp.
Drosophila melanogaster has four pairs of chromosomes (including a pair of sex chromosomes). Sperm from this species are formed by a meiotic process in which homologous chromosomes pair and segregate but do not undergo crossing-over. How many genetically different kinds of sperm could be produced by a Drosophila melanogaster male (XY)?
A) 4 B) 8 C) 16 D) 64 E) 256
A novice gardener notices that many plants in his garden look wilted. What osmotic solution would you suggest the novice gardener use to best return the plants to full health?
A. Place the plants in a 5% solute solution so water can diffuse into the plant cells. B. Place the plants in a 15% solute solution so water can be actively transported out of the plant cells. C. Place the plants in a 5% solute solution so water can be actively transported out of the plant cells. D. Place the plants in a 15% solute solution so water can diffuse out of the plant cells.
Which growth phase has the largest increase in cell numbers per unit of time?
a. death phase b. exponential phase c. lag phase d. stationary phase