Which cells create the feeding current in a sponge?
1.amoebocytes
2.choanocytes
3.mesohyl cells
4.pinacocytes
2
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Viruses simultaneously contain DNA, RNA, and protein
Indicate whether this statement is true or false.
Which of the following is correct regarding the blind spot?
A. It's an area of the retina where rods and cones are concentrated. B. It's caused by a nontransparent area on the cornea. C. It's an area of the retina where there are no rods or cones. D. It's caused by a nontransparent area on the lens.
Biologists now routinely test for homology between genes in different species. If genes are determined to be homologous, it means that they are related _____
A) by descent from a common ancestor B) because of convergent evolution C) by chance mutations D) in function but not structure
Which pathogen would most likely be responsible for a urinary tract infection caused by improper wiping after defecation?
A) Mycoplasma B) Chlamydia C) Escherichia coli D) Salmonella