Question 1
according to fossil evidence, the evolution of eukaryotic cells occurred about ye...
Biology, 02.10.2019 04:50 maystrenko53
Question 1
according to fossil evidence, the evolution of eukaryotic cells occurred about years ago.
3.2 to 6.1 million
250 to 500 million
1.2 to 1.5 billion
3.5 to 3.8 billion
1 points
question 2
the protists include
heterotrophs.
autotrophs.
both a and b
none of the above
1 points
question 3
which of the following statements describes ciliates?
they have no cell walls.
they are unicellular.
they are heterotrophic.
all of the above
1 points
question 4
what do ciliates use small cilia for?
energy
locomotion
reproduction
all of the above
1 points
question 5
euglenoid chloroplasts are surrounded by membranes.
no
four
two
three
1 points
question 6
some autotrophic euglena species become when light levels are low.
inactive
heterotrophic
saprophytic
none of the above
1 points
question 7
red tides release into the ocean.
nutrients
carbon dioxide
oxygen
toxins
1 points
question 8
phylum amoebozoa traditionally included
amoebas.
radiolarians.
foraminiferans.
all of the above
1 points
question 9
are the most numerous unicellular algae in the oceans.
amoebas
golden algae
diatoms
none of the above
1 points
question 10
which of the following have numerous hair-like projections from their flagella?
diatoms
golden algae
water molds
all of the above
Answers: 1
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Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.
Answers: 2
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Which process of living things produces water that enters the water cycle
Answers: 1
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