The nervous system typically
A. is sterile.
B. has a small number of normal flora.
C. contains Gram-positive bacteria.
D. contains a small number of viruses.
A
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Insulin stimulates an increase in number of glucose carrier proteins at a cell membrane’s surface. What effect will insulin have on cell function? Choose all that apply.
_____ An increase in insulin, which will increase the diffusion rate. _____ ATP amounts needed for this transport will increase. _____ Low insulin levels will decrease the number of available carrier proteins. _____ Lack of membrane receptors for insulin will decrease amount of glucose taken in. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about glucose transport? What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
While developing a new hybridization-based molecular test for Cryptosporidium, a protozoan parasite that causes diarrheal illness, a laboratory technician examines the hybridization ability with a closely related, but nontarget, protozoan and also gets a positive test result. In order to improve the stringency of the hybridization reaction for detection of Cryptosporidium only, the technician can
do which of the following? a. Decrease the salt concentration in the hy-bridization buffer b. Increase the salt concentration in the hy-bridization buffer c. Reduce the reaction temperature during hybridization d. Remove destabilizing agents, such as formamide, from the hybridization buffer e. None of the above
Answer the following statements true (T) or false (F)
1. Molecular homologies indicate that living species evolved from a common ancestor or interrelated group of common ancestors. 2. Selective breeding results from programs designed to modify traits in domesticated species. 3. According to Thomas Malthus, food supplies tend to increase arithmetically while populations tend to increase exponentially, which means that populations will outgrow their food supply. 4. Neutral variation is supported by the observation that most changes in codons occur in the third position within the codon, which often has no effect on the sequence of amino acids in the protein.
The relatively simple excretory system used by flatworms consists of tubules called
a. nephrons. b. hepatic tubules. c. metanephridia. d. Malpighian tubules. e. protonephridia.