Practice Questions

TLS Online TPP Program

#Question id: 767

With respect to how miRNAs work, which, if any, of the following statements, is false?

#Unit 1. Molecules and their Interaction Relevant to Biology

An miRNA is initially composed of two RNA strands, a passenger strand that will be destroyed and a complementary RNA, the guide strand, that is required for it to work.
an active miRNA regulates target protein-coding genes by binding to complementary sequences in the mRNA
A single miRNA normally binds to transcripts from just one target gene
A single type of mRNA can be regulated by multiple different miRNAs.

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TLS Online TPP Program

#Question id: 7703

#Unit 9. Diversity of Life Forms

Carolus Linnaeus believed that species remained fixed in the form in which they had been created. Linnaeus would have been uncomfortable with ________.

TLS Online TPP Program

#Question id: 7704

#Unit 9. Diversity of Life Forms

The best classification system is that which most closely ________.

TLS Online TPP Program

#Question id: 7705

#Unit 9. Diversity of Life Forms

Based on this tree, which statement is correct?

TLS Online TPP Program

#Question id: 7751

#Unit 5. Developmental Biology

Ultrastructural studies have led to the characterization of two distinctive cytological

pathways of PCD in plants;

I) Vacuolar-type PCD

II) Hypersensitive response-type (HR-type) PCD

a) cytosol and all its organelles, including the plasma membrane, are completely brokendown

b) The vacuole loses water, resulting in marked cell shrinkage, contraction from the cell wall,

and nuclear DNA degradation

c) PCD occurs in leaves in response to microbial attack

d) cell wall is either partially or completely digested as well, as in endosperm tissue

e) Continued water loss from the cytosol leads to the breakdown of the plasma membrane

and the release of residual cellular contents into the apoplast

Given characterization of PCD pathway match with its type PCD?

TLS Online TPP Program

#Question id: 7752

#Unit 5. Developmental Biology

The autophagy pathway included____

a) the catabolic mechanism that delivers cellular components to lysosomes, where they are degraded

b) Autophagy protects the cell from the harmful or lethal effects of damaged or unnecessary proteins and organelles

c) During starvation, the autophagic breakdown and recycling of cellular components also

ensure cellular survival by maintaining cellular energy levels

Which of the following are the correct prediction about autophagy is true?

TLS Online TPP Program

#Question id: 7753

#Unit 5. Developmental Biology

The best-studied type of plant autophagy, specialized organelles called autophagosomes enclose the cytoplasmic components and fuse with the vacuole, this is called