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Alexandra [31]
3 years ago
7

Where do elctrons get their energy in photosytem I

Biology
1 answer:
Afina-wow [57]3 years ago
5 0

Answer:

When light energy is absorbed by a chlorophyll molecule its electrons gain energy and move to higher energy levels in the molecule

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Why is the hypothesis that black cats cause bad luck not science?
Alja [10]

Because it has no scientific explanation. As a matter of fact it has no explanation.

The things that black cats cause bad luck are a myth, and do not have any proof or explanation, meaning it cannot be concluded neither as a hypothesis nor scientific.


Hope it helped,


BioTeacher101

7 0
3 years ago
a guinea pig with hair (HH) is breed with a guinea pig without hair (hh) what would the phenotype of their offspring be?
iren [92.7K]

Answer:

<u>the genotype is (Hh)</u> <u>phenotype hybrid which is a Guinea pig with hair</u>.( hybrid means its not a pureblood haired Guinea pig. pureblood means same. EX: (GG). Guinea pig with hair. its also known as heterozygous, and zygous.)

witch also means  its heterozygous. there is no percentage chance for something to have a different genotype of phenotype.

6 0
2 years ago
Which unit would be most appropriate for measuring the length of a car? cenitmeter or meter
Bingel [31]
Meters would be best
6 0
2 years ago
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Which of the following are among the most common second messengers?
frosja888 [35]

Answer:

The correct answer would be calcium ion and cAMP.

Secondary messengers refers to the intracellular signaling molecules which pass the signals from the receptors located on the surface of the cell to the target molecule present within the cell.

The secondary messengers can be classified into three major class:

  1. Cyclic nucleotide for example cAMP (cyclic adenosine monophosphate), cGMP (cyclic guanosine monophosphate)
  2. DAG (diacylglycerol) and IP₃ (inositol triphosphate)
  3. Calcium ions (Ca⁺⁺)  

Hence, from the given options, calcium ion and cAMP would make the correct choice.

3 0
3 years ago
If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have
Hoochie [10]
Increased in pitch (frequency). It's the doppler effect.
3 0
3 years ago
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