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cricket20 [7]
3 years ago
10

78. What color pigmentation is associated with pregnancy mask?

Biology
1 answer:
Marianna [84]3 years ago
6 0
Brown. Your pigmentation in pregnancy is browner
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When crude oil is distilled, it is separated into categories. What are those categories characterized by?
goldfiish [28.3K]

Answer:

Differences in their boiling points

Explanation:

When crude oil is distilled and separated into categories, the categories are characterized by the differences in their boiling points.

At different boiling points, each of the fraction will separate out.

  • Crude oil is made up of different fractions of hydrocarbons.
  • As the chain length of the hydrocarbon increases, the volatility reduces and boiling point increases.
  • Components with short carbon lengths rises out from the column first and are cooled and extracted.
  • The categories are thereby, classified based on differences in their boiling points.
6 0
3 years ago
A researcher observing an ecosystem describes the amount of sunlight, precipitation and type of soil present. Which factors is t
anastassius [24]
A researcher observing an ecosystem describes the amount of sunlight, precipitation, and type of soil present. The researcher is most likely describing abiotic factors in a prairie. 
A and B are incorrect because the factors described are abiotic, not biotic.
Di is incorrect because abiotic factors listed include soil, which is not likely to be described in an ocean environment. 
6 0
3 years ago
Which region of the human brain best distinguishes us from other animals?
MAVERICK [17]

Out of the following given choices; a. reticular formation b. cerebral cortex * c. limbic system d. hypothalamus

The answer is B. This region of the brain is responsible for cognition, consciousness, thought, and memory. It is these qualities, especially self-awareness and cognition, that distinguishes humans from other animals. It enables humans to reason, plan and have great social intelligence.


5 0
3 years ago
Indicate whether each of the following statements is true of depurination (DP), deamination (DA), or pyrimidine dimer formation
solniwko [45]

Answer:

- This process is caused by spontaneous hydrolysis of a glycosidic bond: depurination and deamination

- This process is induced by ultraviolet light:  pyrimidine dimer formation

- This can happen to guanine but not to cytosine: depurination

- This can happen to thymine but not to adenine:  pyrimidine dimer formation

- This can happen to thymine but not to cytosine: none

- Repair involves a DNA glycosylase: deamination

- Repair involves an endonuclease: depurination, deamination and  pyrimidine dimer formation

- Repair involves DNA ligase: depurination, deamination and  pyrimidine dimer formation

-  Repair depends on the existence of separate copies of the genetic information in the two strands of the double helix: depurination, deamination and  pyrimidine dimer formation

- Repair depends on cleavage of both strands of the double helix: none

Explanation:

Depurination is the loss of purine bases (either adenine or guanine), while deamination refers to the removal of an amino group. During depurination, a β-N-glycosidic bond is cleaved by hydrolysis and a nucleic base is released (either adenine or guanine). All DNA bases may undergo deamination, except thymine (since thymine does not have an amino group). The ultraviolet (UV) radiation can cause thymine or cytosine to form dimers (e.g., pyrimidine dimers), being thymine dimers the most common lesion when DNA is exposed to UV light. Pyrimidine dimers may be repaired by different excision mechanisms, e.g., nucleotide excision repair, where the recognition of the DNA damage leads to the removal of the DNA fragment containing the lesion. DNA glycosylases are enzymes involved in the mechanism of base excision, these enzymes recognize and remove damaged bases by hydrolysis of the glycosidic bond, producing an abasic (apurinic and apyrimidinic) site. A DNA ligase enzyme covalently joins two DNA molecules by forming a phosphodiester bond, which is required during these processes.

8 0
2 years ago
During photosynthesis, plants use (what) obtained from animals.
Vladimir [108]
They use Carbon dioxide
5 0
3 years ago
Read 2 more answers
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