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den301095 [7]
3 years ago
9

In 1953, the Miller-Urey experiment showed that, under conditions similar to Earth’s early atmosphere, organic compounds could b

e formed from atmospheric gases. The results of this experiment are considered to support which of the following ideas about the origin of life on Earth?
Biology
1 answer:
timofeeve [1]3 years ago
8 0

Answer:

that lightning sparked chemical reactions in Earth's early atmosphere. The early atmosphere contained gases such as ammonia, methane, water vapor, and carbon dioxide. Scientists hypothesize

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What structure of the sarcomere shortens during muscle contraction?
LiRa [457]

Answer:

The Z lines and H- zone shortens during the muscle contraction.

Explanation:

Sarcomere is the area between the two Z lines. The Z- lines are present in the centre of I - band and H - zone is present in the A - band. The actin filaments which are thin filaments present in I- band and contracts, slide over the myosin filament during contraction.

The I - band, H- zones are became shortens as they are thin than the A- band. It is anisotropic band having thick myosin filaments. They are not flexible and remain in its constant shape during the muscle contraction.

After the muscle contraction, the A- band and the H- zone comes to their original shape. In other words, the sarcomere shortens and comes back during muscle contraction, and relaxation.

3 0
3 years ago
Which component of a virus is lacking in a cell?
m_a_m_a [10]

Capsid is the component of a virus that is lacking in its cell

A capsid is the protein shell that surrounds a virus. Capsids functions by protecting the nucleic acids of a virus while interacting with the host environment. Capsids are made up of many oligomeric structural subunits that contains the protein; protomers. Capsids are generally grouped based on their structure. The common ones are helical and icosahedral.


4 0
3 years ago
What is the correct term for organisms that consume other organisms in order to gain energy and are also known as consumers?
ivann1987 [24]

Answer:

Heterotrophs

Explanation:

A heterotroph is an organism that eats other plants or animals for energy and nutrients.

3 0
3 years ago
Read 2 more answers
3 alternative energy sources
yarga [219]
2. sun, wind, rain
i think it’s that
8 0
3 years ago
The genes R, E and D are independently assorting and control production of red pigment as follows (recessive alleles are not fun
Alona [7]

Answer:

1/8

Explanation:

An individual must have all three dominant alleles to be red, in homozygosis or heterozygosis (R_E_D_).

<u>The parental cross was:</u>

RREEDD x rreedd

F1: RrEeDd

<u>The test cross</u> is between the RrEeDd indiviudals and homozygous recessive rreedd.

The genes assort independently, so we can use Mendel's law of segregation to predict separately for each gene the proportion of the offspring that will have the dominant alleles.

<h3><u>Rr x rr</u></h3>

1/2 Rr

1/2 rr

<h3><u>Ee x ee</u></h3>

1/2 Ee

1/2 ee

<h3><u>Dd x dd</u></h3>

1/2 Dd

1/2 dd

Genes are independent, so the probability of having a R_E_D_ offpsring is calculated by multiplying the individual probabilities of having a dominant allele for each gene:

1/2 (Rr) × 1/2 (Ee) × 1/2 (Dd)= 1/8

8 0
3 years ago
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