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Natalija [7]
3 years ago
11

Chlorophyll molecules are the most abundant pigments in plants that are responsible for collecting light for photosynthesis. Whi

ch of the following statements are true? The two main forms of chlorophyll are chlorophyll a and b. These molecules resemble the protoporphyrins in hemoglobin and myoglobin, except these contain Fe+2 rather than Mg+2. They require the presence of accessory pigments such as beta-carotene and lutein in order to function. They absorb light in the blue and red region of the visible spectrum, which is why they appear green.
Biology
1 answer:
Alchen [17]3 years ago
3 0

Answer: Option A.

The two types of chlorophyll are chlorophyll A and B.

Explanation:

Chlorophyll is the green pigments present in chloroplast (organelles) that is found in plants which is used for photosynthesis by reacting with carbon dioxide and water to produce carbohydrates. The two types of chlorophyll are; chlorophyii A and chlorophyll B.

Chlorophyll A is the primary photosynthetic pigment that absorb energy from blue- violet light and orange red lights wavelengths.

Chlorophyll B is the accessory pigment to receive energy and transmit it to chlorophyll A. Chlorophyll B absorbs energy from green lights wavelengths.

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In the late 1980s and early 1990s, the percentage of Icelandic children whose bacterial infections were caused by bacteria resis
Nadya [2.5K]

Answer:

The correct answer would be - "bacterial populations evolve in response to the selection pressure imposed by antibiotics".

Explanation:

The given information provided in the question about the bacterial infection supports the hypothesis that the bacterial population shows the evolution in response to the selection pressure caused by the antibiotics due to the fact that bacteria increased resistance gradually with time. This resistance towards antibiotics increased the percentage of bacterially infected children in the late 1980s and early 1990s.

In this case, the population of bacteria having resistance genes is selected to evolved selected to increase their offsprings.

5 0
3 years ago
Two autosomal genes, J and K, are 60 map units apart. You perform the following testcross: J K / j k x j k / j k. At what freque
Dmitry [639]

Answer:

  • J K / j k = 20%
  • j k / j k = 20%
  • J k / j k = 30%
  • j K / j k = 30%                

Explanation:

To calculate the recombination frequency, we have to know that 1% of recombinations = 1 map unit = 1cm. And that the maximum recombination frequency is always 50%.

The map unit is the distance between the pair of genes for which every 100 meiotic products, one of them results in a recombinant one.

So, en the exposed example:

  • J and K are autosomal genes
  • J and K are separated by 60 M.U.
  • 60 M.U. means that there is 60% of recombination.

Cross)             J K / j k                    x                  j k / j k

Gametes) JK  Parental                                     jk, jk, jk, jk

                jk   Parental                                  

                Jk   Recombinant                          

                 jK   Recombinant

One map unit equals 1% of recombination frequency. This means that every 100 meiotic products, one of them is a recombinant one.

1 M.U. -------------- 1% recombination

60 M.U. ------------ 60% recombination

                              30% Jk  +  30% jK

100 M.U. - 60 M.U. = 40 M.U.

40M.U.--------------40 % Parental (Not recombinant)

                            20% JK   +   20% jk

Punnet Square)           JK       jk      Jk      jK

                          jk     JK/jk   jk/jk   Jk/jk   jK/jk

J K / j k = 20%

j k / j k = 20%

J k / j k = 30%

j K / j k = 30%                                

3 0
3 years ago
A human fingernail has a hardness of approximately 2.5. Which mineral is softer than a finger nail. A. calcite B. gypsum C. apat
denis23 [38]
According to the 2011 Earth Science Reference Table, Selenite Gypsum has an approximate hardness of 2.

The hardness of calcite is 3.

The hardness of apatite is 5 according to the Moh's hardness scale.

The hardness of diamond is 10.
3 0
3 years ago
Read 2 more answers
Help me find out the answers. thank you.​
lawyer [7]

Answer:

2.) C

3.)Traits & population

4.)A ,C, & D

3 0
3 years ago
List and describe the factors which affect the speed of a chemical reaction
skelet666 [1.2K]
Factors that influence the reaction rates of chemical reactions include the concentration of reactants, temperature, the physical state of reactants and their dispersion, the solvent, and the presence of a catalyst.

Source: Google
6 0
3 years ago
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