Answer the following statements true (T) or false (F)
1. Malpighian tubules of insects secrete rather than filter to eliminate waste products.
2. The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans.
3. The blood supply to the loop of Henle also exhibits a countercurrent arrangement.
4. Based on phylogenetic analyses of the mineralcorticoid and glucocorticoid receptors and the presence or absence of their ligands (glucocorticoids and aldosterone) in certain vertebrates, it would appear that hormones always evolve prior to their receptors.
5. It would be reasonable to assume that environmental cues such as photoperiod and temperature might regulate animal reproduction.
1. TRUE
2. FALSE
3. TRUE
4. FALSE
5. TRUE
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Self-reactive B cells are removed during embryonic development in the bone marrow through a process referred to as ________ selection.
A. ablative B. positive C. negative D. clonal
The Punnett square illustration above shows
that theoretically a. half of human sperm carry a Y chromosome. b. half of human zygotes are XY. c. all zygotes carry an X chromosome. d. gender depends upon which type of sperm fertilizes the egg. e. all of these are true
The probability that two genes will be separated by crossing-over is related to:
a. the phenotype that they control. b. how far the two genes are from the centromere. c. the distance between the two genes on the chromosome. d. whether the two genes are located on a sex chromosome. e. how far the genes are from the kinetochore
Answer the following questions true (T) or false (F)
1. Bacteria store their DNA within a spherical nucleus. 2. When bacteria undergo binary fission, they produce identical daughter cells. 3. Most bacteria present in the human intestines are pathogenic.