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xz_007 [3.2K]
4 years ago
8

Can blood go backwards from the right ventricle to the right atrium?

Biology
2 answers:
kiruha [24]4 years ago
7 0

Answer:

as the atrium contracts, blood flows from right atrium I to your right ventricle through the open tricuspid valve. when the ventricle is full , the tricuspid valve shuts. this prevent the blood from flowing backward into the right atrium while the ventricle contracts. so the answer is no

mamaluj [8]4 years ago
3 0

Answer:

yes

Explanation:

as the atrium contracts , blood flows from your right atrium into your right ventricle through the open tricuspid valve. when the ventricle is full, the tricuspid valve shust . this prevents blood from flowing backward into the right atrium while the ventricle contracts

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Several biology students are counting kernels in an ear of corn. They count a total of 420 kernels: 242 purple wrinkled, 84 purp
s2008m [1.1K]
The answer is C) 9:3:3:1

This looks like a dihybrid cross where the expected phenotypic ratio is 9:3:3:1. However, in nature, the numbers cannot be absolut. Let's check it out:
242 purple wrinkled
84 purple smooth
70 yellow wrinkled
24 yellow smooth

Divide all by the smallest number:
242 purple wrinkled / 24
84 purple smooth / 24
70 yellow wrinkled / 24
24 yellow smooth / 24

We have 
10.1 purple wrinkled which is near to 9
3.5 purple smooth which is near to 3
2.9 yellow wrinkled which is near to 3
1 yellow smooth
6 0
3 years ago
Read 2 more answers
A young female is unconscious after intentionally ingesting a large amount of aspirin. You will MOST likely find her respiration
Inessa05 [86]

Answer:

Deep and rapid.

Explanation:

Respiration may be defined as the process of exchange of gases between the atmosphere, alveoli and body tissue. Two important process of respiration are inspiration and expiration.

Aspirin drug may also effect the rate of respiration in the individual. The breathing rate get increased after taking the excess dose of aspirin. The increase in the breathing rate results in the rapid and deep breathing of the individual.

Thus, the correct answer is option (b).

4 0
3 years ago
Assuming the population begins in H−W equilibrium, what is C1 allele frequency after one generation of natural selection? Expres
DIA [1.3K]

Complete question:

In a population of flowers growing in a meadow, C1 and C2 are autosomal codominant alleles that control flower color. The alleles are polymorphic in the population, with f (C1) = 0.7 and f (C2) = 0.3. Flowers that are C1C1 are yellow, orange flowers are C1C2, and C2C2 flowers are red. A storm blows a new species of hungry insects into the meadow, and they begin to eat yellow and orange flowers but not red flowers. The predation exerts strong natural selection on the flower population, resulting in relative fitness values of C1C1 = 0.30, C1C2 = 0.60, and C2C2 = 1.0. Assuming the population begins in H−W equilibrium, what is C1 allele frequency after one generation of natural selection? Express your answer using three decimal places.

Answer:      

The C1 allele frequency after one generation of natural selection equals 0.559

Explanation:

Due to technical problems, you will find the complete answer and explanation in the attached file.    

Download pdf
4 0
3 years ago
What causes earthquakes?<br> How are earthquakes measured and how big can they get?
k0ka [10]

Explanation:

Earthquakes are caused by friction at the ends of tectonic plates. WHen they become stuck at their edges from this friction, stress builds up,, and eventually overcomes the friction, becoming an earthquake. Earthquakes are measured on the Richter scale. The largest earthquake ever documented was 9.5 in Chile on May 22nd, 1960.

5 0
2 years ago
Complete the following vocabulary exercise related to the process of translation of mRNA to protein by the ribosome. Match the w
schepotkina [342]

The answers;

1. Termination. Out of the 64 codons, UAG, UAA, and UGA are the stop codons that terminate translation when encountered by the ribosome. These three do not code for any amino acid but rather cause the translation complex to dislocate.


2. Translation. In this process, the ribosome ‘reads’ the codon and brings in a t-RNA with an anticodon to the codon. This tRNA carries a specific amino acid (for that codon) and engages in the P-site of the ribosome. The amino acid is taken from the t-RNA and used to elongate the polypeptide chain being formed. Thereafter the empty t-RNA dislocates.


3. Aminoacyl-tRNA synthetase. When a tRNA brings in an amino acid to the initiation complex, it is dislocated when ‘empty’. Aminoacyl-tRNA synthetase then catalyzes the reattachment of another amino acid through a chemical reaction called esterification. The cognate tRNA then become an aminoacyl-tRNA.


4. tRNA . Every tRNA has an amino acid attached to it. The type of amino acid (out of the 22 amino acids) is determined by the anticodon on the tRNA. There are many codons that are amino acids meaning that there are redundant codons that specify for the same amino acid.


5. Initiation. Initiation begins by the formation of an initiation complex. This complex is comprosed by the two subunits of the ribosome, and the mRNA. The complex becomes compelete when a Met-tRNA (a tRNA with a methionine amino acid) engages the P-site and then translation begins.


7 0
3 years ago
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