Why has the diverse group of protists traditionally been grouped together?
a. They all have the same type of nutrition.
b. They are not prokaryotes, fungi, plants, or animals.
c. They all have very similar shapes.
d. They all have very similar DNA sequences
Ans: b. They are not prokaryotes, fungi, plants, or animals.
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The first group to exhibit an amniotic egg was the ____
a. cartilaginous fish b. amphibians c. reptiles d. bony fish e. mammals
Nicotine mimics ____ in its effects on the nervous system
a. adrenalin b. acetylcholine c. dopamine d. endorphins e. analgesics
According to the fossil record, the first modern humans appeared approximately:
a. 190 million years ago. b. 100,000 years ago. c. 1 million years ago. d. 6,000 years ago. e. 6 million years ago.
Urinary catheters pose risks of causing urinary tract infections because
A) they can introduce bacteria from the skin, anal, or external genital areas into the bladder. B) they provide a surface for bacterial biofilms to establish and they can introduce bacteria from the skin, anal, or external genital areas into the bladder. C) they provide a surface for bacterial biofilms to establish. D) they block urine flow out of the bladder. E) they block urine flow out of the bladder and they can introduce bacteria from the skin, anal, or external genital areas into the bladder.