Trichomoniasis is a bacterial infection that is sexually transmitted; chronic infection often results in blindness, damage to the nervous system, and eventually death
Indicate whether the statement is true or false
FALSE
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In some cells, there are many ion electrochemical gradients across the plasma membrane even though there are usually only one or two proton pumps present in the membrane. The gradients of the other ions are most likely accounted for by _____
A) cotransport proteins B) ion channels C) pores in the plasma membrane D) passive diffusion across the plasma membrane E) cellular metabolic reactions that create or destroy ions
Why is Taq polymerase used in a polymerase chain reaction (PCR)?
A. Taq polymerase has proofreading activity and thus makes fewer errors than other DNA polymerases. B. Unlike other DNA polymerases, Taq polymerase is heat stable and survives the 94 degree denaturation step in PCR. C. Unlike other DNA polymerases, Taq polymerase is not inhibited by dideoxy nucleotides. D. Taq polymerase can produce DNA from an RNA template, unlike other DNA polymerases. E. Taq polymerase is more efficient than other DNA polymerases.
The first primates with an angled skull base that were probably able to make a wide range of sounds to aid speech were
A) Homo habilis. B) Homo erectus. C) Homo afarensis. D) Homo sapiens.
A cell biologist produces a karyotype of mouse somatic cells arrested in mitosis. She sees 40 chromosomes, which is completely normal for mice. Based on this information, what is the haploid number of chromosomes for mice?
A. 20 B. 40 C. 80 D. 10 E. It cannot be determined from the information provided.