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AlladinOne [14]
2 years ago
10

Which of these is a characteristic of index fossils?

Biology
1 answer:
algol132 years ago
3 0

Answer:

c is the right answer

Explanation:

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What element is the most abundant in the earth's crust?
MrRa [10]
The element that is the most abundant in the Earth's crust is oxygen. It makes up 46.6% of the crust. It is followed by silicon, aluminum, iron, etc.
3 0
2 years ago
Fat absorption through the plasma membrane of epithelial cells ________.
erastovalidia [21]

Answer:

C) occurs by simple diffusion because lipids are able to penetrate the hydrophobic fatty acid tails within the plasma membrane

Explanation:

After digestion of lipids, monoglycerides and fatty acids associate with bile salts and phopholipids to form micelles. Micelles are structures that are necessary for the transport the poorly soluble monoglycerides and fatty acids to the surface of the enterocyte. But, micelles cannot be absorbed by epithelial cell, only freely dissolved monoglycerides and fatty acids can. Free fatty acids and monogycerids can just diffuse across the plasma membrane because of their nonpolar nature.

 Some absorption (e.g. for cholesterol) may be facilitated by specific transport proteins.

5 0
2 years ago
In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environmen
katen-ka-za [31]

Answer: option C) negatively charged and contains less sodium

Explanation:

In the absence of any stimulus, a neuron is said to be resting. During this time, more positively charged potassium ions (K+) than sodium ions (Na+) occupy the interior of its cell membrane, whereas more sodium ions than potassium occupies the exterior - making the cell membrane to be electrically Polarized with net positive charge outside and a net negative charge inside the cell membrane.

Thus, the interior is negatively charged and contains less sodium ions

5 0
2 years ago
What two parts of a nucleotide do not ?change throughout the structure of DNA a. Five-Carbon Sugar and Phosphate Group b. Five-C
Stolb23 [73]

Answer:

a. Five-Carbon Sugar and Phosphate

Explanation:

A nucleotide can be defined as an organic molecule which forms the building block of nucleic acid such as deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).

Basically, nucleotide comprises of the following parts;

1. Nitrogenous base: this includes adenine (A), thymine (T), guanine (G), and cytosine (C) which are mainly found in the DNA while adenine (A), guanine (G), uracil (U) and cytosine (C) are found in the RNA.

2. A phosphate group.

3. A penrose sugar: it is either deoxyribose in DNA or ribose in RNA.

The two parts or chemical components of a nucleotide which do not change throughout the structure of DNA are;

I. Five-Carbon Sugar also known as deoxyribose and it has hydrogen on its second carbon.

II. Phosphate: this is the structural backbone that provides support to DNA.

3 0
2 years ago
If the current population size of bison is 3,652 and the maximum growth rate of the population is 0.28, calculate the population
s344n2d4d5 [400]

<u>Given:</u>

Present population of bison = 3652

Maximum growth rate = 0.28

<u>To find:</u>

The population of bison after one year.

<u>Solution:</u>

The future population can be calculated with the help of the following formula,

P_F=P_P\times(1+r)^n

where P_F is the future population, P_P is the present population, r is the growth rate and n is the number of years.

On substituting the given values in the formula we get,

\Rightarrow P_F=3652\times(1+0.28)^1

\Rightarrow P_F=3652\times1.28\rightarrow4674.56\approx4675

Therefore, the population size of bison after one year is 4675. The park does not have to control the population because the growth rate is on an average scale.

4 0
2 years ago
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