1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
erma4kov [3.2K]
3 years ago
13

Cultures of a bacterial species were incubated out on the incubator shelf, in an anaerobic jar, and in a candle jar. After incub

ation, there was moderate growth of cultures in the candle and anaerobic jars, but heavy growth of the culture on the incubator shelf. This species is a/an...
facultative anaerobe? T/F
Biology
1 answer:
Mila [183]3 years ago
6 0

Answer:

True

Explanation:

Facultative anaerobes are bacteria who used to grow in the aerobic condition but when oxygen becomes deficient they can switch to anaerobic mode and obtain energy through fermentation. So facultative anaerobe normally lives in aerobic condition but can survive in anaerobic conditions too.

So as facultative anaerobes normally grows in aerobic condition they grow well in incubator shelf but in anaerobic condition like anaerobic jar or in a candle jar they will show moderate growth because it is not the ideal condition for them to grow. Therefore the statement is true.

You might be interested in
Humans have 23 chromosome pairs. other members of the hominidae, including chimpanzees, gorillas, and orangutans, have 24. what
VladimirAG [237]
I would probably go for evolution
8 0
3 years ago
Which substance reduces the level of acid in blood?<br> sodium<br> bicarbonate<br> urea<br> nitrogen
prisoha [69]
Hsjebebr u hwjbecrhwjwjwbjwjwbejsjebejejrbrudhrhdirj
8 0
3 years ago
What is a biome? View available hint(s) what is a biome? A specific set of abiotic factors a major type of ecosystem a set of si
IceJOKER [234]
A large and naturally occurring community of flora and fauna occupying a major habitat
8 0
3 years ago
PLEASE PLEASE HELP ME!!!! (10 POINTS!)
Oksi-84 [34.3K]

Answer:

 

en Espanol en Español     print print

Bottlenecks and founder effects

Genetic drift can cause big losses of genetic variation for small populations.

Population bottlenecks occur when a population's size is reduced for at least one generation. Because genetic drift acts more quickly to reduce genetic variation in small populations, undergoing a bottleneck can reduce a population's genetic variation by a lot, even if the bottleneck doesn't last for very many generations. This is illustrated by the bags of marbles shown below, where, in generation 2, an unusually small draw creates a bottleneck.

Loss of genetic variation as a result of a population bottleneck

Download this graphic from the Image library.

Reduced genetic variation means that the population may not be able to adapt to new selection pressures, such as climatic change or a shift in available resources, because the genetic variation that selection would act on may have already drifted out of the population.

Elephant seal

 

An example of a bottleneck

Northern elephant seals have reduced genetic variation probably because of a population bottleneck humans inflicted on them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century. Their population has since rebounded to over 30,000 — but their genes still carry the marks of this bottleneck: they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted.

Founder effects

A founder effect occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have:

reduced genetic variation from the original population.

a non-random sample of the genes in the original population.

For example, the Afrikaner population of Dutch settlers in South Africa is descended mainly from a few colonists. Today, the Afrikaner population has an unusually high frequency of the gene that causes Huntington's disease, because those original Dutch colonists just happened to carry that gene with unusually high frequency. This effect is easy to recognize in genetic diseases, but of course, the frequencies of all sorts of genes are affected by founder events.

Explanation:

7 0
3 years ago
Which of the following may cause a 12-year-old to have a height above 6 feet?
Dovator [93]

Answer:

adefective adrenal gland can lead to oversecretion of growth hormones

8 0
3 years ago
Other questions:
  • Compare and contrast an ecosystem driven by photosynthesis to an ecosystem driven by chemosynthesis.
    7·1 answer
  • Explain the units and how to solve the following metric conversion the inside of the metric conversion by filling in the blank.
    13·1 answer
  • What does cells mean
    10·2 answers
  • What characteristic is shared by both inceptisols and entisols, the soils of flood plains?
    7·2 answers
  • Which statement about how geologists study the ages of rock layers is true?
    11·2 answers
  • What is the difference between an element mixture and compound
    15·2 answers
  • 2. Describe sexual reproduction.
    6·2 answers
  • During which eon did oxygen begin to build up the most in Earth’s atmosphere? a.)Phanerozoic b.)Proterozoic c.)Hadean d.)Archean
    7·1 answer
  • Cell membranes have specific protein channels for the movement of water, these structures are peripheral aquaporins hydrophilic
    5·1 answer
  • Discuss your thoughts on the overall lab design. Did it help you understand the concepts better, or did it raise more questions?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!