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Tems11 [23]
3 years ago
8

Need help emt class science

Biology
1 answer:
lara [203]3 years ago
5 0

Answer:

  1. true
  2. false
  3. true

Explanation:

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When light energy excites electrons in photosystem II, where do the electrons to replace them come from?
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A microbiologist is in the process of classifying a newly discovered organism. Its characteristics include:
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A fungus

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he complete set of an organism's or population's genes. A variation at a single position in a DNA sequence among individuals of
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Answer:

The complete set of an organism's or population's genes. B. genome

A variation at a single position in a DNA sequence among individuals of the same species. F. single nucleotide polymorphism (SNP)

A lab instrument used to precisely measure and move small amounts of liquid. E. micropipette

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A word that means to copy. I. amplify

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A process that separates pieces of DNA by their size using an electrical current. K. gel electrophoresis

A series of chemical reactions that generate a cellular response. L. signal transduction

A molecule that binds to another molecule. G. ligand  

Explanation:

Genome is also defined as a full set of genetic material in an organism.

SNP is usually referred to a substitution of a single nucleotide at a specific position in the DNA.

Micropipette is used for the precise measurement and for the exact amount of liquid delivery.

PCR is a widely used technique in molecular biology, used for the amplification (replication) of DNA fragments. It is performed thanks to heat-resistant enzyme (Taq polymerase) through the cyclic reactions. Polymerases are enzymes that add nucleotides in order to make chanis-polymers of nucleic acid (polymerization) and they require short DNA segment (primer) in order to start the polymerization. Restriction enzymes are enzymes that recognize and cut DNA at specific site (restriction site) and are widely used in DNA cloning.

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What allele combination results in type A blood?​
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Sharks, whales, and dolphins share similar features such as body shape and the position of fins. However, sharks have gills for
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Answer:

Part a:

Whales and sharks share a common ancestor for superficial characteristics

Part b:

The vestigial pelvic bone of whales and dolphins indicates that they descended from an ancestor that lived on land.

Explanation:

Part a:

Whales and sharks possess similar body shapes and fin positions not because of descent from a common ancestor but due to their shared aquatic habitat. Whales share more characteristics with humans than with sharks. This indicates close phylogenetic ties (ancestral similarities) between humans and whales whereas sharks and whales have evolved independently. If they shared a common ancestor, they would have similar anatomical characters as well.

Part b:

Vestigial Structure:

A vestigial structure is an anatomical characteristic that is believed to have served a specific function for an organism in the past but as the organism evolved, the structure lost its function.

Pelvic bones are required by animals to move their lower limbs to be able to walk on land.  Whales possess vestigial pelvic bones because they have evolved from an ancestor that lived on land.

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