Which of the following is an example of negative feedback?
A) During birthing contractions, oxytocin (a hormone) is released and acts to stimulate further contractions.
B) When a baby is nursing, suckling leads to the production of more milk and a subsequent increase in the secretion of prolactin (a hormone that stimulates lactation).
C) After a blood vessel is damaged, signals are released by the damaged tissues that activate platelets in the blood. These activated platelets release chemicals that activate more platelets.
D) When the level of glucose in the blood increases, the pancreas produces and releases the hormone insulin. Insulin acts to decrease blood glucose. As blood glucose decreases, the rate of production and release of insulin decreases as blood glucose decreases.
D
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Based on what you know about the biochemical composition of cells from Chapter 1 in your text book, the primary information containing building blocks of chromosomes are likely
A. amino acids. B. lipids. C. nucleotides. D. carbohydrates.
In transcription,
a. several amino acids are assembled by the messenger RNA molecules at one time. b. a special sequence, called a promoter, is necessary for transcription to begin. c. certain polypeptide sequences are governed by one ribosome, while other sequences are produced by other ribosomes. d. the transfer RNA molecules arrange the messenger RNA codons into the appropriate sequence. e. a special sequence, called an intron, is necessary for transcritpion to begin
DNA vaccines ____
a. use RNA to assist in the transformation process b. have been created but are ineffective c. show promise in animal studies and are now in clinical trials d. have been approved by the government to fight several diseases e. sometimes infect the subject with the disease it’s attempting to fight
Cell condition in which only one of each type of chromosome is present.
What will be an ideal response?